Difference between symmetric and asymmetric encryption, Strategic Management

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(a) Illustrate the difference between symmetric and asymmetric encryption, listing an advantages and a disadvantage of each.

(b) What functions should be given by a public key infrastructure (PKI)? Is it possible to operate such an encryption method without a PKI?

(d) What do you understand by certificate revocation? When does it occur? When a certificate is revoked, who is responsible for the revocation?

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